Hypothalamus
(Composed
of neurosecretory cells of the floor of diencephalons secrete neurohormones).
Location: Floor
of diencephalons of brain; connected to the anterior lobe of pituitary byhypophyseal
blood vessel, and with posterior lobe of pituitary through the axons of its
neurons.Some
hormones are poured into adenohypophysis (anterior, and intermediate
pituitary), through hypophysial
portal system while two hormones (oxytocin and ADH) are directly
taken by nerve
cells in neurohypophysis (posterior pituitary). Hormones poured in
adenohypophysis function
as releasing or inhibiting hormones.
They are peptide in nature.
Hormones:
(i) Thyrotropin Releasing Hormone (T-RH): Release of TSH from anterior pituitary.
(ii) Adrenocorticotropin- Releasing Hormone
(A-RH): Release of ACTH from anterior pituitary.
(iii) Somatotropin Releasing hormone (S-RH): Release of SH from anterior pituitary.
(iv) Gonadotropin- Releasing hormone (G-RH): Release of goandotropins from the
anterior
pituitary.
(v) Growth inhibiting hormone (GIH) or
somatostatin: Inhibits the hormone from
pituitary.
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